Greensboro is getting a taste of winter early this year. Temperatures have dropped sharply into the 40s today, with a freeze warning in effect as lows are expected to hit the upper 20s tonight. Meteorologists say a cold front from the north is responsible for the sudden chill, making it feel more like mid December than November. Students showed up bundled in coats and hoodies, and locals are being urged to protect plants and outdoor pipes before nightfall. It might be early, but this cold snap is a clear sign winter’s knocking on Greensboro’s door…